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ground glass

noun
1.
Optics. glass that has had its polished surface removed by fine grinding and that is used to diffuse light.
2.
glass that has been ground into fine particles, especially for use as an abrasive.
Origin
1840-1850
1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ground glass

ground glass

noun
1.
glass that has a rough surface produced by grinding, used for diffusing light
2.
glass in the form of fine particles produced by grinding, used as an abrasive
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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8
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